After booting with the kern and mfsroot floppies, choose
<literal>custom
</literal> from the installation menu. In the custom installation menu, choose
<literal>partition
</literal>. In the partition menu, you should delete all existing partitions using
<keycap>d
</keycap>. After deleting all existing partitions, create a partition using
<keycap>c
</keycap> and accept the default value for the size of the partition. When asked for the type of the partition, make sure the value is set to
<literal>165
</literal>. Now write this partition table to the disk by pressing
<keycap>w
</keycap> (this is a hidden option on this screen). If you are using an ATA compatible compact flash card, you should choose the FreeBSD Boot Manager. Now press
<keycap>q
</keycap> to quit the partition menu. You will be shown the boot manager menu once more - repeat the choice you made earlier.